摘要
采用平均声强作为检测量,设计出一种基于单个矢量水听器的低功耗弱信号值班检测系统。针对矢量信号特有的 90°相移、指向性零点、相乘再积分、正负双极性等问题,设计了宽带全通 90°移相网络、双通道检测、1Bit模数混合乘法器、定时放电、绝对值检测等功能电路。系统设计中兼顾高增益、低功耗、稳定可靠等实际需要,并选用微功耗模拟器件。系统仿真研究显示,该系统作用距离超过 2km。初步设计制作的实验电路板,工作带宽达到1. 8kHz,工作电流 5mA,稳定可靠。
A low power feeble signal detection system on watch based on single vector hydrophone has been designeo in which average intensity is detected. Problems characteristic of vector signals such as 90° phase difference, zeroes in directivity, multiplication and integration, and double polarity were solved with appropriate functional circuits. High gain, low power and good stability have been taken into account, and micro-power analong circuits used. System simulation shows that the effective range of the system exceeds 2km. Test on an experimental unit indicates that the bandwidth of operation is from 30Hz to 1. 8kHz. The circuit works stably with a total current of only 5mA.
出处
《声学技术》
EI
CSCD
北大核心
2005年第1期1-3,25,共4页
Technical Acoustics
